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I had the same on my San Remo 4 bbl skeet set. There was a tiny bit of rust in the pin/spring area. Remove stock & put 3-4 drops good oil where the hammer hits the firing pin(I like WD-40 for this)& work the pin back & forth 40-50 times. Flush with more oil,do this several times. Flush & oil with what you like,install stock. I had to remove stock several times. If it does not go away,you may have a broken pin spring or a burr.